ScrollView嵌套ListView及ListView嵌套的高度计算方法

public void setListViewHeightBasedOnChildren(ListView listView) {
  // 获取ListView对应的Adapter
  ListAdapter listAdapter = listView.getAdapter();
  if (listAdapter == null) {
   return;
  }
  int totalHeight = 0;
  // listAdapter.getCount()返回数据项的数目
  for (int i = 0; i < listAdapter.getCount(); i++) {
   View listItem = listAdapter.getView(i, null, listView);
   // 计算子项View 的宽高
   listItem.measure(0, 0);
   // 统计所有子项的总高度
   totalHeight += listItem.getMeasuredHeight();
  }
  ViewGroup.LayoutParams params = listView.getLayoutParams();
  params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
  // listView.getDividerHeight()获取子项间分隔符占用的高度
  // params.height最后得到整个ListView完整显示需要的高度
  listView.setLayoutParams(params);
 }